Android has always been quite vigilant and is prompt to kill off any app at the MFA login screen while I am consulting the Oracle of Authenticator in another task. Thanks Android!

That being said, I dislike having 3 dozen apps open because I simply can’t quickly find and switch to the ones I’m using. So when I enter a new situation, I swipe all the way left, and Clear All apps, to start over with a tabula rasa.